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Measurement of the semileptonic charge asymmetry using Bs^0 -> D_s mu X decays

Research output: Contribution to journalJournal article


Journal publication date3/01/2013
JournalPhysical Review Letters
Journal number1
Number of pages7
Early online date7/07/12
Original languageEnglish


We present a measurement of the time-integrated flavor-specific semileptonic charge asymmetry in the decays of Bs mesons that have undergone flavor mixing, a^s_ls, using B_s^0 (barB_s^0) -> D_s^-/+ mu^+/- X decays, with D_s^-/+ -> phi pi^-/+ and phi K^+ K^-, using 10.4 fb^-1 of proton-antiproton collisions collected by the D0 detector during Run II at the Fermilab Tevatron Collider. A fit to the difference between the time-integrated D_s^-$ and D_s^+ mass distributions of the B_s^0 and barB^0_s candidates yields the flavor-specific asymmetry a^s_ls = [-1.08 pm 0.72 (stat) +/-0.17 (syst)]% which is the most precise measurement and in agreement with the standard model prediction.

Bibliographic note

7 pages, 3 figures, submitted to Phys. Rev. Lett